Drive spindle



Oct. 26, 1965 T. GADDE ETAL 3,214,109

DRIVE SPINDLE Filedoct. 25, 1963 2 Sheets-sweet 1 /N VEW TORS TORE GADDEU SIGVARD GUNNAR BOSTROM Oct. 26, 1965 1-.GADDE ETAL 3,214J09 DRIVESPINDLE Filed Oct. 25, 1963 2 Sheets-Shee'tl 2 Fig. 3

/NVENTORS TORE GADDE United States Patent Olfice 3,2l4,l09 Patented Oct.26, 1965 3,214,109 DRIVE SPINDLE Tore Gadde, Amal, and Sigvard GunnarBostrm, Jakobsberg, Sweden, assignors to AB Amals Gjuteri och MekaniskaNerkstad, Amal, Sweden, a Corporation of Sweden Filed Oct. 25, 1963,Ser. No. 319,028 Clairns priority, application Sweden, June 12, 1963,6,463/ 63 2 Claims. (Cl. 242-72) This invention has reference to animproved drive spindle for gripping winding sleeves for paper rolls etc.which is provided with expanding means adapted to create suflicientfriction between the spindle and the sleeve to drive the latter alongwith the rotation of the spindle.

In an earlier known construction the expansion means comprises a hoseput over an inner shaft of the drive spindle and tightened with the endsagainst the shaft. The latter is provided with a device for feedingcompressed air into the space between the hose and the shaft and thehose is enclosed in a cylindrical expansion device with a number oflongitudinally extending rails which are interconnected at the endswhere they also are carried by the shaft. When the hose is filled withcompressed air, the rails are at their central portion bent outwards toform arcs. This device has turned out to have a very good function whenthe stresses on the drive spindle do not exceed a certain value.However, in case the paper roll is very heavy, the bending out of therails will be unequal which causes an eccentricity.

The object of the present invention is to eliminate this drawback.According to the invention the expanding means comprise hoses insertedeach in a longitudinal notch in the shaft, said noses being connected toa compressed air source and each being adapted, when blown up, to move apressing element in the notch outside the hose radially outwards so thatits radially outer border, serving as a catching border, will extendoutside the periphery of the spindle.

The blowing up of the hoses will be absolutely uniform and the hoseswill have a considerable carrying capacity. There cannot occur anyuneven loading even with very great paper rolls.

The separate hoses according to the invention may be pumped to aconsiderably higher pressure than the single hose in the above recitedembodirnent of a drive spindle.

The invention will now be elucidated with reference to the accompanyingdrawings, in Which:

FIG. 1 shows a longitudinal section through a drive spindle according tothe invention,

FIG. 2 is a side elevation of a drive spindle with only one carryingtrunnion,

FIG. 3 shows on an enlarged scale a longitudinal section through aportion of the drive spindle according to FIG. 1 at one end of the same,and

IFIG. 4 shows a cross section through the spindle on the line IV-IV inFIG. 1.

According to the embodiment shown in FIGS. 1, 3 and 4 the -drive spindlecomprises an uninterrupted carrying shaft 1, the two ends 2 of whichserve as carrying trunnions. The shaft 1 is provided with longitudinalnotches i from said bore 8 to one end of each one of the notches 3. Theouter end of the bore 8 is provided with a device 10 through whichcompressed air can Ibe forced into the spindle.

In each one of the notches 3 there is, inside the rails 5, arranged ahose 11 of rubber or a similar elastic material. At one end the hoses 11a-re provided with a nipple 12 engaging a corresponding radial channel'9 through which the bore 8 communicates with the interior of thecorresponding hose '11. On the nipple 12 there is arranged a hose piece-13 serving as a lip tightening, the radially inner free end 14 of saidhose piece 13 being pressed against the wall of said bore 9 by the airpressure in the same.

Reference numerals 15 and `16 denote outer and inner protection hoses ofrubber and reference numerals 17 and 18 interposed layers of rubber. Awire 19 wound around the hose 11 gives the required connection at oneend of the hose 11 the walls of which being interconnected by means ofrubber solution as at 20.

When a paste board sleeve 21 has been put on the drive spindle thedevice l10 is connected to a source of compressed air (not shown). Thehoses are blown up uniformly and the rails 5 are forced radiallyoutwards while clamping the sleeve 21 strictly concentrically. Byd-riving the spindle, the paper web is then wound on the sleeve 21.

The drive spindle shown in FIG. 2 corresponds constructively in allessential parts to the embodiment shown in the aforegoing. The carryingshaft 2', however, is in this case provided with only one shaft trunnon.This drive spindle is intended to -be used for rather short paper rolls23.

(Fhe shown and described embodments are to be regarded as examples onlyand the drive spindle may be constructively modified in many ways withinthe scope of the appended claims. The number of rails 5, notches 3 andhoses 1'1 in the drive spindle is independent of the invention. However,the minimum number is three. Of course, other material than paper may bewound on the drive spindle. Instead of rails v5 it is possible to useother pressure elements which by the hoses 11 are moved radiallyoutwards. As examples may -be mentioned pistons radially movable inbores.

iWhat we claim is:

1. A drive spindle for use with a winding sleeve for a paper roll or thelike, which comprises a carrying shaft having its central portiongreater in diameter than its two end portions, a plurality ofcircumferentially spaced notches extending longitudinally for the fulllength of said central portion, an elongated pressing element receivedin each notch for radial movement into and out of gripping engagementwith a winding sleeve, an elongated fluid-pressure inflatable memberdisposed in each notch radially inwardly of the associated pressingelement, the length of each inflatable member being such that it extendsbeyond the central portion onto the end portions of said carrying shaft,an axial bore extending into one end portion of said carrying shaft, aplurality of channels extending from the inner end of said axial -boreradially -outwardly through said one end portion, there being one suchradial channel for each of said notches, a nipple fitted in one end ofeach inflatable member with its stem extending through said inflatablemember into the correspondng radial channel, the fluid passage throughsaid nipple being so formed that incomng pressure fluid is di-rectedlongitudinally into said inflatable member toward its other end, meansto circumferentially clamp the respective ends of said infiatablemembers against the corresponding end portions of said carrying shaft,the clamping means for said one end of said in- 3 4 flatable membersoverlying the nipples in said inflatable References Cited by theExaminer members and thereby holding said nipples in place in the UNITEDSTATES PATENTS respective radi-al channels, and a sleeve fitted overeach end portion of said carrying shaft to enclose the respec- 23129132/43 Wallacetive ends 'of said inflatable members and the respective 53,006 152 10/61 Rusche 242 72 clamping means.

2. A drive spindle according to claim 1, which includes v FOREIGNPATENTS a flexible coupling attached to the inner end of each nipple1254333 1/ 61 Francestem and adapted to be expanded |by the incomingpressure fluid into tight engagement With the corresponding 10 MERVINSTEIN: Pr'mary Exfllmmefradial channel. STANLEY N. GILREATH, Examiner.

1. A DRIVE SPINDLE FOR USE WITH A WINDING SLEEVE FOR A PAPER ROLL OR THELIKE, WHICH COMPRISES A CARRYING SHAFT HAVING ITS CENTRAL PORTIONGREATER IN DIAMETER THAN ITS TWO END PORTIONS, A PLURALITY OFCIRCUMFERENTIALLY SPACED NOTCHES EXTENDING LONGITUDINALLY FOR THE FULLLENGTH OF SAID CENTRAL PORTION, AN ELONGATED PRESSING ELEMENT RECEIVEDIN EACH NOTCH FOR RADIAL MOVEMENT INTO AND OUT OF GRIPPING ENGAGEMENTWITH A WINDING SLEEVE, AN ELONGATED FLUID-PRESSURE INFLATABLE MEMBERDISPOSED IN EACH NOTCH RADIALLY INWARDLY OF THE ASSOCIATED PRESSINGELEMENT, THE LENGTH OF EACH INFLATABLE MEMBER BEING SUCH THAT IT EXTENDSBEYOND THE CENTRAL PORTION ONTO THE END PORTIONS OF SAID CARRYING SHAFT,AN AXIAL BORE EXTENDING INTO ONE END PORTION OF SAID CARRYING SHAFT, APLURALITY OF CHANNELS EXTENDING FROM THE INNER END OF SAID AXIAL BORERADIALLY OUTWARDLY THROUGH SAID ONE END PORTION, THERE BEING ONE SUCHRADIAL CHANNEL FOR EACH OF SAID NOTCHES, A NIPPLE FITTED IN ONE END OFEACH INFLATABLE MEMBER WITH ITS STEM EXTENDING THROUGH SAID INFLATABLEMEMBER INTO THE CORRESPONDING RADIAL CHANNEL, THE FLUID PASSAGE THROUGHSAID NIPPLE BEING SO FORMED THAT INCOMING PRESSURE FLUID IS DIRECTEDLONGITUDINALLY INTO SAID INFLATABLE MEMBER TOWARD ITS OTHER END, MEANSTO CIRCUMFERENTIALLY CLAMP THE RESPECTIVE ENDS OF SAID INFLATABLEMEMBERS AGAIST THE CORRESPONDING END PORTIONS OF SAID CARRYING SHAFT,THE CLAMPING MEANS FOR SAID ONE END OF SAID INFLATABLE MEMBERS OVERLYINGTHE NIPPLES IN SAID INFLATABLE MEMBERS AND THEREBY HOLDING SAID NIPPLESIN PLACE IN THE RESPECTIVE RADIAL CHANNELS, AND A SLEEVE FITTED OVEREACH END PORTION OF SAID CARRYING SHAFT TO ENCLOSE THE RESPECTIVE ENDSOF SAID INFLATABLE MEMBERS AND THE RESPECTIVE CLAMPING MEANS.